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Abstract
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In this work, nanocomposites were prepared by filling polyester matrix with SrTiO 3 by using some spinel
ferrites such as magnetite, cobalt ferrite, manganese ferrite, and polyaniline (PANi) as fillers. These
nanocomposites were synthesized by the hydrothermal and co-precipitation and hydrothermal and
interfacial polymerization. Radar absorption parameters were measured in the X-band range by the
transmission line method by using a straight rectangular waveguide. X-ray diffraction analyzer, scanning
electron microscope, and vector network analyzer were used to characterize the materials. The Taguchi
method was used to optimize and study the effects of the weight ratios of fillers, type of spinel ferrite, and
thickness on the radar absorption properties of nanocomposites by the total weight ratio of fillers of only
5%. The optimal conditions were a nanocomposite of manganese ferrite as the magnetic filler with a
weight ratio of 2:1 for both spinel ferrite/SrTiO 3 and spinel ferrite + SrTiO 3 /PANi at 1-mm thickness. All
the prepared nanocomposites had a broadband reflection loss spectrum less than ?20 dB over the entire
X-band.
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